mfd: 88pm860x: Device tree support

Signed-off-by: Haojian Zhuang <haojian.zhuang@gmail.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>

1 files changed, 34 insertions, 9 deletions

diff --git a/drivers/rtc/rtc-88pm860x.c b/drivers/rtc/rtc-88pm860x.c
index feddefc42109..de9e854b326a 100644
--- a/drivers/rtc/rtc-88pm860x.c
+++ b/drivers/rtc/rtc-88pm860x.c
@@ -11,6 +11,7 @@
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/of.h>
 #include <linux/platform_device.h>
 #include <linux/slab.h>
 #include <linux/mutex.h>
@@ -284,6 +285,28 @@ out:
 }
 #endif
 
+#ifdef CONFIG_OF
+static int __devinit pm860x_rtc_dt_init(struct platform_device *pdev,
+                                        struct pm860x_rtc_info *info)
+{
+        struct device_node *np = pdev->dev.parent->of_node;
+        int ret;
+        if (!np)
+                return -ENODEV;
+        np = of_find_node_by_name(np, "rtc");
+        if (!np) {
+                dev_err(&pdev->dev, "failed to find rtc node\n");
+                return -ENODEV;
+        }
+        ret = of_property_read_u32(np, "marvell,88pm860x-vrtc", &info->vrtc);
+        if (ret)
+                info->vrtc = 0;
+        return 0;
+}
+#else
+#define pm860x_rtc_dt_init(x, y)        (-1)
+#endif
+
 static int __devinit pm860x_rtc_probe(struct platform_device *pdev)
 {
         struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
@@ -294,8 +317,6 @@ static int __devinit pm860x_rtc_probe(struct platform_device *pdev)
         int ret;
 
         pdata = pdev->dev.platform_data;
-        if (pdata == NULL)
-                dev_warn(&pdev->dev, "No platform data!\n");
 
         info = kzalloc(sizeof(struct pm860x_rtc_info), GFP_KERNEL);
         if (!info)
@@ -345,9 +366,11 @@ static int __devinit pm860x_rtc_probe(struct platform_device *pdev)
                 }
         }
         rtc_tm_to_time(&tm, &ticks);
-        if (pdata && pdata->sync) {
-                pdata->sync(ticks);
-                info->sync = pdata->sync;
+        if (pm860x_rtc_dt_init(pdev, info)) {
+                if (pdata && pdata->sync) {
+                        pdata->sync(ticks);
+                        info->sync = pdata->sync;
+                }
         }
 
         info->rtc_dev = rtc_device_register("88pm860x-rtc", &pdev->dev,
@@ -366,10 +389,12 @@ static int __devinit pm860x_rtc_probe(struct platform_device *pdev)
 
 #ifdef VRTC_CALIBRATION
         /* <00> -- 2.7V, <01> -- 2.9V, <10> -- 3.1V, <11> -- 3.3V */
-        if (pdata && pdata->vrtc)
-                info->vrtc = pdata->vrtc & 0x3;
-        else
-                info->vrtc = 1;
+        if (pm860x_rtc_dt_init(pdev, info)) {
+                if (pdata && pdata->vrtc)
+                        info->vrtc = pdata->vrtc & 0x3;
+                else
+                        info->vrtc = 1;
+        }
         pm860x_set_bits(info->i2c, PM8607_MEAS_EN2, MEAS2_VRTC, MEAS2_VRTC);
 
         /* calibrate VRTC */